package com.hmdp.service.impl;

import cn.hutool.core.bean.BeanUtil;
import cn.hutool.core.bean.copier.CopyOptions;
import cn.hutool.core.util.RandomUtil;
import com.baomidou.mybatisplus.extension.conditions.query.QueryChainWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.hmdp.dto.LoginFormDTO;
import com.hmdp.dto.Result;
import com.hmdp.dto.UserDTO;
import com.hmdp.entity.User;
import com.hmdp.mapper.UserMapper;
import com.hmdp.service.IUserService;
import com.hmdp.utils.RegexUtils;
import com.hmdp.utils.UserHolder;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.connection.BitFieldSubCommands;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;

import javax.servlet.http.HttpSession;

import java.time.LocalDateTime;
import java.time.format.DateTimeFormatter;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

import static com.hmdp.utils.RedisConstants.*;
import static com.hmdp.utils.SystemConstants.USER_NICK_NAME_PREFIX;


/**
 * <p>
 * 服务实现类
 * </p>
 *
 */
@Slf4j
@Service
public class UserServiceImpl extends ServiceImpl<UserMapper, User> implements IUserService {

    @Autowired
    private StringRedisTemplate   stringRedisTemplate;

    @Override
    public Result sendCode(String phone, HttpSession session) {
        // TODO 发送短信验证码并保存验证码
        if(RegexUtils.isPhoneInvalid(phone)) {
            return Result.fail("手机号格式错误!");
        }

        String code = RandomUtil.randomNumbers(6);

        stringRedisTemplate.opsForValue().set(LOGIN_CODE_KEY+phone,code,LOGIN_USER_TTL, TimeUnit.MINUTES);

        log.info("发送短信验证码成功,验证码为{}", code);

        return Result.ok();
    }

    @Override
    public Result loginForm(LoginFormDTO loginForm, HttpSession session) {
        //1.效验手机号
        String phone = loginForm.getPhone();
        if(RegexUtils.isPhoneInvalid(phone)) {
            //2.如果不符合返回错误信息
            return Result.fail("手机号不存在!!");
        }
        //3.从redisz中获取验证码并效验
        String catchCode = stringRedisTemplate.opsForValue().get(LOGIN_CODE_KEY + phone);

        if(catchCode == null||!catchCode.equals(loginForm.getCode())) {
            return Result.fail("你输入的验证码错误！！！");
        }
       //4.根据手机号进行查询用户
        User user = query().eq("phone",phone).one();

        //5.判断用户是否存在，不存在则创建
        if(user == null) {
            user = creatUserWithPhone(phone);
        }
        //6.保存用户信息到redis中，生成一个随机的key
        String token = UUID.randomUUID().toString();
        //7.将User对象转为UserDTO,把隐私属性去掉
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);

        //8.将UserDTO对象转为HashMap存储,便于存储
        Map<String, Object> userMap = BeanUtil.beanToMap(userDTO, new HashMap<>(), CopyOptions.create()
                .setIgnoreNullValue(true)
                .setFieldValueEditor((fieldName, fieldValue)
                        -> fieldValue.toString()));
         //9.存储
        String tokeKey = LOGIN_USER_KEY + token;
        stringRedisTemplate.opsForHash().putAll(tokeKey,userMap);
        //10.设计tokenKey的有效期
        stringRedisTemplate.expire(tokeKey,LOGIN_USER_TTL, TimeUnit.MINUTES);

        return Result.ok(token);

    }

    @Override
    public Result queryUserById(Long id) {

        User user = getById(id);
        if(user == null) {
            return Result.ok();
        }
        UserDTO userDTO = BeanUtil.copyProperties(user, UserDTO.class);
        return Result.ok(userDTO);
    }

    @Override
    public Result sign() {
        //1.得到当前登录用户的id
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.写入redis SETBIT KEY offset 1
        stringRedisTemplate.opsForValue().setBit(key,dayOfMonth-1,true);
        return Result.ok();


    }

    @Override
    public Result signCount() {

        //1.得到当前登录用户的id
        Long userId = UserHolder.getUser().getId();
        //2.获取日期
        LocalDateTime now = LocalDateTime.now();
        //3.拼接key
        String keySuffix = now.format(DateTimeFormatter.ofPattern(":yyyyMM"));
        String key = USER_SIGN_KEY + userId + keySuffix;
        //4.获取今天是本月的第几天
        int dayOfMonth = now.getDayOfMonth();
        //5.获取本月到今天为止的所有签到记录 bitfield sign:4:202510 get u7 0
        List<Long> result = stringRedisTemplate.opsForValue().bitField(key,
                BitFieldSubCommands.create()
                        .get(BitFieldSubCommands.BitFieldType.unsigned(dayOfMonth)).valueAt(0));
        if(result == null||result.isEmpty()){
            //没有任何签到结果
            return Result.ok(0);
        }
        Long num = result.get(0);
        if(num==null||num==0){
            return Result.ok(0);
        }
        //6.循环遍历查看连续签到的天数
        int count = 0;

        while(true){
            // 6.1.让这个数字与1做与运算，得到数字的最后一个bit位,判断这个bit位是否为0
            if((num & 1) == 0){
                // 如果为0，说明未签到，结束
                break;
            }else{
                // 如果不为0，说明已签到，计数器+1
                count++;
            }
            // 把数字右移一位，抛弃最后一个bit位，继续下一个bit位
            num >>>= 1;
        }
        return Result.ok(count);

    }

    private User creatUserWithPhone(String phone) {
        User user = new User();
        user.setPhone(phone);
        user.setNickName(USER_NICK_NAME_PREFIX+RandomUtil.randomString(10));
        save(user);
        return user;
    }
}
